please read this and explain to me what to do pleae I'm a english is my 2nd languagee so i don't really understand. pleasse i really need it

According to the loco mass the mass of reactants and products

What is responsible for the uneven heating between the poles and the equator on any given day

In trying to determine whether dna or protein is the genetic material, hershey and chase made use of which of the following facts? a) dna contains sulfur, whereas protein does not. b) dna contains phosphorus, whereas protein does not. c) dna contains nitrogen, whereas protein does not. d) dna contains purines, whereas protein includes pyrimidines.